People using an iPhone or an iPad are being warned against saying something to Siri.

Online pranksters have been urging smartphone users to state 108 to the voice-controlled personal assistant.

But saying the number to Siri will put you through to emergency services in your area, reports Mirror Online . This is because the number is equivalent to the emergency number 999 in India and Siri will recognise it as an emergency call.

So if anyone asks you to speak the number 108 into Siri, just don't.

Mixed messages on Twitter

While some iPhone users have been taking to Twitter telling others to say the number 108 to Siri, adding things like, "You'll thank me later," others are being more sensible and are adding a word of caution.